National Archives of Japan: 変貌–江戸から帝都そして首都へ– (henbō – Edo kara teito soshite shuto e –, "Transfiguration: From Edo to Imperial capital, then to [state/national] capital"; Japanese, includes some maps showing the territorial expansion 1868–1893 and the establishment of subdivisions of Tokyo)
tokubetsu-ku kyōgikai (特別区協議会; "Conference of special wards"; an association of the 23 special wards/"cities" that cover former Tokyo City since 1947): 東京23区のおいたち (Tōkyō-23ku no oitachi)Diarsipkan 2018-10-05 di Wayback Machine. (pdf; Japanese)